System for use of land fills and recyclable materials
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United States of America Patent
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Jan 20, 2009
Grant Date -
Jan 12, 2006
app pub date -
Sep 6, 2005
filing date -
May 22, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Gases are vented from a waste site such as a landfill, and the gases are separated into at least three streams comprising a hydrocarbon stream, a carbon dioxide stream, and residue stream. At least a portion of the carbon dioxide stream and hydrocarbon stream are liquefied or converted to a supercritical liquid. At least some of the carbon dioxide gas stream (as a liquid or supercritical fluid) is used in a cleaning step, preferably a polymer cleaning step, and more preferably a polymer cleaning step in a polymer recycling process, and most preferably in a polymer cleaning step in a polymer recycling system where the cleaning is performed on-site at the waste site.
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